JP2018120863A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device including a communication passage capable of discharging gas generated in an abnormality to the outside of an exterior body, in which foreign matters or the like are less likely to enter a space of the interior of the exterior body of the power storage device and also water is less likely to enter from the communication passage.SOLUTION: A power storage device includes one or more power storage elements 400 and an exterior body 200 housing the one or more power storage elements 400 therein. The exterior body 200 includes a communication part 130 forming a communication passage W10 for communicating between an internal space S1 and an external space S2 of the exterior body 200. The communication part 130 is characterized by: (1) having a functional membrane 160 making gas pass therethrough and not making a liquid pass therethrough; (2) being communicated with the internal space S1 in a first direction; and (3) being communicated with the external space S2 in a second direction different from the first direction.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a power storage device in which one or more power storage elements are housed in an exterior body.

  Equipped with non-aqueous electrolyte secondary batteries such as lithium-ion batteries as power sources or auxiliary power sources for EVs such as EVs (electric vehicles), PHEVs (plug-in hybrid electric vehicles), HEVs (hybrid electric vehicles), and gasoline engine vehicles. A power storage device is used (see, for example, Patent Document 1). Among such power storage devices, there are those in which a plurality of single cells are hermetically sealed in an exterior body.

  By the way, in the case of abnormalities such as overcharge and internal short circuit, the non-aqueous electrolyte secondary battery opens a gas discharge valve (safety valve) provided in the unit cell, and gas is discharged from the safety valve to the inside of the exterior body. . For this reason, some power storage devices are provided with an exhaust port (communication path) for discharging gas to the outside of the exterior body.

JP 2007-195311 A

  However, since this exhaust port is a communication portion in which a communication path that connects the space inside the exterior body of the power storage device and the space outside the exterior body is formed, for example, the power storage device is mounted on an automobile. In such a case, for example, foreign matters such as water splashing from the outside during high-pressure car washing or traveling may enter the exterior body of the power storage device through the communication path.

  In addition, when a predetermined water pressure is applied to the exterior body when the power storage device is submerged, water is likely to flow into the exterior body of the power storage device from the exhaust port. is there.

  Therefore, the present invention has been made in view of such a situation, and is a power storage device having a communication path that can discharge gas generated at the time of an abnormality to the outside of the exterior body, and is provided inside the exterior body of the power storage device. It is an object of the present invention to provide a power storage device in which foreign matter such as water hardly enters and water does not easily flow into the exterior body from the communication path.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention includes one or more power storage elements and an exterior body that houses the one or more power storage elements, and the exterior body includes the exterior body. A communication part that forms a communication path for communicating a space inside the body and an external space, the communication part having (1) a functional film that allows gas to pass but does not allow liquid to pass (2) The first space communicates with the internal space in a first direction, and (3) the second space communicates with the external space in a second direction substantially orthogonal to the first direction.

  The functional film may be arranged in a direction substantially parallel to the second direction.

  Further, the communication portion is configured by a first member and a second member, the first member forms a first passage on the inner side of the exterior body in the communication passage, and the second member is A second passage outside the exterior body in the communication passage may be formed, and the functional film may be held by being sandwiched between the first member and the second member.

  The other inner wall of the first member and the second member is formed with a facing portion that faces one end of the first member and the second member, and the functional film includes the first member and the second member. You may hold | maintain between one edge part of one member and said 2nd member, and the other opposing part of said 1st member and said 2nd member.

  The communication portion further includes an annular gasket for sealing the first member and the second member, which is sandwiched between portions where the first member and the second member are joined. Also good.

  In order to achieve the above object, the battery pack includes one or more power storage elements and an exterior body that houses the one or more power storage elements, and the exterior body communicates an internal space of the exterior body with an external space. A communication portion that forms a communication passage for causing the gas to pass through and a functional membrane that does not allow liquid to pass through.

  According to this, since the communication part is provided with a functional film that allows gas to pass but does not allow liquid to pass through, foreign matters such as water scattered in the communication part are transferred from the communication path to the inside of the exterior body. It is possible to prevent intrusion and water from flowing into the exterior body from the communication path when submerged.

  Further, for example, when the pressure in the space inside the exterior body is equal to or lower than a predetermined pressure, the communication portion is in a first state in which the communication path is blocked, and the pressure in the internal space is larger than the predetermined pressure. A pressure valve that is in a second state in which the internal space communicates with the external space in the communication path, and the pressure valve is located on the external space side of the functional membrane in the communication path. May be arranged.

  According to this, the space inside the exterior body communicates with the outside space only when the pressure in the space inside the exterior body rises higher than the pressure in the space outside the exterior body. There are provided a pressure valve that performs pressure adjustment and a functional film that allows gas to pass through to the inner space side of the pressure valve in the communication path. And the pressure valve is arrange | positioned in the space side outside the function film | membrane.

  For this reason, when the pressure in the space inside the exterior body becomes larger than a predetermined pressure due to the generation of gas from the power storage element in the event of an abnormality, the gas can pass through the functional membrane, and the pressure valve Since it is in a state, the generated gas can be discharged to the outside of the exterior body. In addition, since the pressure valve is normally in the first state, the space inside the exterior body can be kept in a sealed state, and foreign matter can enter the internal space from the space outside the exterior body. Can be reliably prevented. Furthermore, when a predetermined water pressure is applied to the communication path, such as when submerged, it is possible to prevent the entry of water, which is difficult to prevent with a pressure valve, by the functional membrane that does not allow liquid to pass through. Even in such a case, water can be prevented from entering the space inside the exterior body. Moreover, even if water injected at high pressure in a high pressure car wash enters, the pressure valve can prevent the water from reaching the functional membrane. For this reason, it is possible to prevent the functional membrane from being damaged by the high-pressure jetted water.

  In addition, for example, the communication portion includes a first member and a second member, and the first member forms a first passage on the inner side of the exterior body in the communication passage, and the second member Forms a second passage outside the exterior body in the communication passage, and the functional film may be held by being sandwiched between the first member and the second member.

  According to this, the communication path is composed of two members, a first member constituting the inner side and a second member constituting the outer side and holding the pressure valve. And the second member are held by sandwiching the functional film. For this reason, the structure by which a functional film is arrange | positioned inside the communicating path rather than a pressure valve is realizable with a simple structure.

  Further, for example, in the first member and the second member, one outer wall surface of the first member and the second member and the other inner wall surface of the first member and the second member are screwed together. May be joined.

  According to this, since the first member and the second member are joined by screwing, it is possible to realize stronger joining between the first member and the second member with a simple configuration.

  Further, for example, the other inner wall of the first member and the second member is formed with a facing portion facing one end of the first member and the second member, and the functional film is You may hold | maintain by being pinched | interposed by one edge part of said 1st member and said 2nd member, and the other opposing part of said 1st member and said 2nd member.

  According to this, the functional film is held by being sandwiched between one end of the first member and the second member joined by screwing and the other facing portion. For this reason, it is possible to realize a stronger holding of the functional film with a simple configuration.

  In addition, for example, the communication portion further includes an annular gasket for sealing the first member and the second member, which is sandwiched between portions where the first member and the second member are joined. May be.

  According to this, since the gasket is provided between the first member and the second member, the joint portion of the first member and the second member can be more closely contacted, for example, at a predetermined time when submerged. When water pressure is applied to the communication path, water can be prevented from entering the interior of the exterior body from the joint.

  According to the power storage device of the present invention, the power storage device has a communication path that can discharge the gas generated at the time of abnormality to the outside of the exterior body, and it is difficult for foreign matter or the like to enter the space inside the exterior body of the power storage device, And it can prevent that water penetrate | invades from a communicating path.

1 is a perspective view of a power storage device according to an embodiment of the present invention. It is a disassembled perspective view of an electrical storage apparatus. It is an enlarged view of the part of area | region A1 in FIG. It is the schematic which shows the flow of the gas discharged | emitted from the internal space of the exterior body of an electrical storage apparatus when gas generate | occur | produces at the time of abnormality. It is a figure which shows the structure of the communicating path of an exterior body. It is a figure which shows the specific example for implement | achieving the structure which provides a pressure valve in the external space side of a communicating path, and provides a functional film in the internal space side. It is bb sectional drawing at the time of assembling the exploded perspective view of FIG. It is a figure which shows the communicating path of a modification (1). It is a figure which shows the communicating path of the other form of a modification (1).

  Hereinafter, embodiments will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present invention are described as optional constituent elements that constitute a more preferable embodiment.

(Embodiment)
FIG. 1 is a perspective view of a power storage device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the power storage device. FIG. 3 is an enlarged view of a region A1 in FIG.

  In these figures, the Z-axis direction is shown as the up-down direction, and in the following, the Z-axis direction will be described as the up-down direction, but depending on the usage mode, the Z-axis direction may not be the up-down direction, The Z-axis direction is not limited to the vertical direction. Further, in each of the X-axis direction, the Y-axis direction, and the Z-axis direction in these drawings, the direction ahead of the arrow is the plus direction, and the opposite direction is the minus direction. The same applies to the following drawings.

  As shown in these drawings, power storage device 100 includes exterior body 200, a plurality of bus bars 300, and a plurality (four in the present embodiment) of power storage elements 400.

  The exterior body 200 is a box-shaped member that houses a plurality of power storage elements 400. The exterior body 200 forms a sealed internal space S1 and houses a plurality of power storage elements 400 in the internal space S1. The exterior body 200 includes a bottomed rectangular tube-shaped exterior body main body 220 and a lid body 210 that closes an opening of the exterior body main body 220. The exterior body 220 has a plurality of power storage elements 400 arranged in the X-axis direction at predetermined positions, protects each power storage element 400 from an impact, etc., and each power storage element 400 unintentionally contacts a metal member or the like. It is a member which avoids. The exterior body 200 is made of an insulating material such as a resin.

  The exterior body 200 includes an external positive terminal 110 and an external negative terminal 120. The external positive terminal 110 and the external negative terminal 120 are terminals connected to an external load to supply power stored in the power storage device 100 to an external load, or power supplied from an external power source is stored in the power storage device. A terminal connected to an external power source for storing in 100.

  The lid 210 has a communication portion 130 that forms a communication path W10 for communicating the internal space S1 formed by the exterior body 200 and a space outside the exterior body (hereinafter referred to as “external space S2”). Note that, for example, an exhaust hose 500 communicating with the outside air is connected to the terminal end of the communication unit 130 (that is, the outer end of the communication unit 130). Moreover, although the communication part 130 is formed in the cover body 210, it may be formed in the exterior body main body 220. That is, the communication part 130 should just be formed in the exterior body 200, and the position in which the communication part 130 is formed in the exterior body 200 is not limited.

  The power storage element 400 is an element that can be charged and discharged, and includes a conductive container 410, a positive electrode terminal 420, and a negative electrode terminal 430. The power storage element 400 is a secondary battery including a non-aqueous electrolyte, for example, a lithium ion secondary battery. Note that a capacitor may be employed as the power storage element 400 instead of the lithium ion secondary battery. The container 410 of the storage element 400 is provided with a safety valve 440 for discharging the gas generated inside the container 410 when an abnormality occurs such as when the storage element 400 is overcharged or when an internal short circuit occurs. The positive electrode terminal 420 and the negative electrode terminal 430 protrude above the container 410. The plurality of power storage elements 400 are arranged in a row in the X-axis direction in a state where the upper side of the container 410 is turned sideways so as to face the Y-axis direction.

  In addition, each of the plurality of power storage elements 400 is connected to the opposite pole terminals by a bus bar 300 that is a metal plate member. That is, the plurality of power storage elements 400 are connected in series by the bus bar 300. The plurality of power storage elements 400 connected in series by the bus bar 300 have a positive electrode side connected to the external positive electrode terminal 110 and a negative electrode side connected to the external negative electrode terminal 120 via the circuit board 310.

  The circuit board 310 is housed outside the arrangement direction (X-axis direction) of the plurality of power storage elements 400 in the internal space S1 of the exterior body 220. The circuit board 310 has a function of monitoring an electrical state such as a charging state or a discharging state of the plurality of power storage elements 400 or controlling charging / discharging of the plurality of power storage elements 400.

  Next, the communication part 130 is demonstrated using FIG. 4 and FIG. FIG. 4 is a diagram illustrating a flow of gas discharged from the internal space of the exterior body of the power storage device when gas is generated from the power storage element during an abnormality. FIG. 5 is a diagram illustrating a configuration of a communication path of the exterior body.

  As shown in FIG. 5, the communication unit 130 includes a pressure valve 150 and a functional film 160. The pressure valve is in a first state in which the communication path W10 is closed when the pressure in the internal space S1 is equal to or lower than a predetermined pressure, and when the pressure in the internal space S1 is higher than the predetermined pressure, the internal space S1 and the external space in the communication path W10. It will be in the 2nd state which makes S2 communicate. The pressure valve 150 is preferably a return type valve, and is an umbrella valve in the present embodiment. The detailed structure of the pressure valve 150 will be described later. The “return type valve” is a valve capable of adjusting the pressure a plurality of times so that the pressure between the internal space S1 and the external space S2 becomes equal. The pressure valve 150 is preferably a return type, but is not limited to the return type. The functional film 160 is a film that is disposed closer to the internal space S1 than the pressure valve 150 in the communication path W10, and is a film that allows gas to pass but does not allow liquid to pass. The functional film 160 is a film made of a waterproof / breathable material having waterproofness and air permeability (moisture permeability) such as Gore-Tex (registered trademark) and TEMISH (registered trademark), and a film made of nonwoven fabric. .

  In this way, the pressure valve 150 fills the internal space S1 with the gas generated from each power storage element 400 in an abnormal state, and the internal space S1 and the external space S2 are separated when the internal space S1 becomes a predetermined pressure or higher. It will be in the 2nd state made to communicate. That is, at the time of abnormality, since the pressure valve 150 is in the second state and the functional film 160 allows gas to pass therethrough, the gas generated from each power storage element 400 is removed from the exterior body 200 as indicated by the white arrows in FIG. From the internal space S1 to the external space S2 through the communication path W10.

  FIG. 6 is a diagram illustrating a specific example for realizing a configuration in which a pressure valve is provided on the external space side of the communication path and a functional film is provided on the internal space side. FIG. 6 is an exploded perspective view of the communication portion 130A. Note that the communication unit 130 </ b> A described in FIG. 6 is a form of the communication unit 130 illustrated in FIGS. 1 to 4.

  7 is a cross-sectional view taken along line bb when the exploded perspective view of FIG. 6 is assembled.

  As shown in FIGS. 6 and 7, the communication portion 130 </ b> A is configured by a first member 131 and a second member 140. The first member 131 forms a first passage W11 inside the exterior body 200 in the communication passage W10. The second member 140 is connected to the outside of the exterior body 200 of the first member 131. Moreover, the 2nd member 140 forms the 2nd channel | path W12 of the exterior side of the exterior body 200 in the communicating path W10. Furthermore, the second member 140 holds the pressure valve 150 in the second passage W12. Both the first member 131 and the second member 140 are formed in a cylindrical shape, and are joined to the inner wall surface 132 of the first member 131 so that the outer wall surface 141 of the second member 140 contacts. The first member 131 has a female thread formed on the inner wall surface 132. The second member 140 has a male screw formed on the outer wall surface 141. That is, the first member 131 and the second member 140 are joined by screwing the inner wall surface 132 of the first member 131 and the outer wall surface 141 of the second member 140. Further, on the inner wall of the first member 131, a facing portion 133 that is opposed to the end portion 142 of the second member 140 on the inner space S1 side in the X-axis direction is formed. The communication portion 130 </ b> A further includes a gasket 170 between the facing portion 133 of the first member 131 and the end portion 142 of the second member 140. The gasket 170 is an annular member for sealing the first member 131 and the second member, which is sandwiched between portions where the first member 131 and the second member 140 are joined. The functional film 160 is held by being sandwiched between the facing portion 133 of the first member 131 and the end portion 142 of the second member 140 via the gasket 170.

  Here, the detailed structure of the pressure valve 150, which is an umbrella valve, will be described with reference to FIG. FIG. 7A is a cross-sectional view showing when the pressure valve 150 is in the first state, and FIG. 7B is a cross-sectional view showing when the pressure valve 150 is in the second state.

  As shown in FIG. 7, the pressure valve 150 includes a shaft portion 151 and an umbrella-shaped umbrella portion 152 that extends from the end portion of the shaft portion 151 in the circumferential direction. An opening 143 and a through hole 144 are formed at the boundary between the internal space S1 and the external space S2 in which the pressure valve 150 is provided. The through hole 144 is penetrated by the shaft portion 151 of the pressure valve 150. That is, the pressure valve 150 is fixed at a predetermined position by the shaft portion 151 passing through the through hole 144. A plurality of openings 143 are formed around the through hole 144. The opening 143 is closed by the umbrella 152 of the pressure valve 150.

  In the pressure valve 150, when the pressure difference between the internal space S1 and the external space S2 that is normal is less than a predetermined pressure difference, the umbrella portion 152 closes the opening 143 as shown in FIG. On the other hand, in the pressure valve 150, when the pressure in the internal space S1 is larger than the pressure in the external space S2 by a predetermined pressure difference or more, the umbrella portion 152 floats from the opening 143 as shown in FIG. The state becomes the state where the internal space S1 and the external space S2 are communicated. That is, the pressure valve 150 is in a first state in which the opening 143 is closed when the pressure in the internal space S1 is equal to or lower than a predetermined pressure, and the internal pressure at the opening 143 when the pressure in the internal space S1 is higher than the predetermined pressure. This is a second state in which the space S1 and the external space S2 are communicated. In short, the pressure valve 150 performs pressure adjustment to bring the pressure in the internal space S1 closer to the pressure in the external space S2 of the exterior body 200 by being in the second state, and switching between the first state and the second state It functions as a return type valve that can be repeatedly performed. The “predetermined pressure” is a pressure higher than the pressure in the external space S2 of the exterior body 200. The predetermined pressure is determined by the shape or material of the pressure valve 150, and the pressure valve 150 corresponding to the desired predetermined pressure can be selected.

  According to power storage device 100 in accordance with the present embodiment, only when the pressure in internal space S1 of exterior body 200 is higher than the pressure in external space S2 of exterior body 200, external body 200 of power storage device 100 is internal. A pressure valve 150 that adjusts the pressure by communicating the space S1 and the external space S2, and a functional film 160 that allows gas to pass through the communication passage W10 to the inner space S1 side than the pressure valve 150 are provided. . For this reason, when the pressure of the internal space S1 of the exterior body 200 becomes larger than a predetermined pressure due to the generation of gas from the power storage element 400 at the time of abnormality, the gas can pass through the functional film 160, and the pressure valve Since 150 is in the second state, the generated gas can be discharged to the external space S2. Further, since the pressure valve 150 is normally in the first state, the internal space S1 of the exterior body 200 can be kept in a sealed state, and foreign matter can enter the internal space S1 from the external space S2 of the exterior body 200. Intrusion can be prevented. That is, for example, when a predetermined water pressure is applied to the communication portion 130, such as when submerged, it is possible to prevent the inflow of water, which is difficult to prevent by the pressure valve 150, by the functional film 160 that does not allow liquid to pass through. Even when a predetermined water pressure is applied to the communication portion 130, it is possible to prevent water from flowing into the internal space S1 of the exterior body 200. Further, even when water injected with high pressure from a high pressure car wash or the like enters, the pressure valve 150 can prevent the water from reaching the functional membrane 160. For this reason, it is possible to prevent the functional film 160 from being damaged by the high-pressure jetted water. As described above, the power storage device 100 can prevent water from entering the internal space S1 of the exterior body 200, and thus can prevent a short circuit from occurring between the plurality of power storage elements.

  Further, according to power storage device 100 according to the present embodiment, communication portion 130A includes first member 131 that forms the inner side, and second member 140 that forms the outer side and holds pressure valve 150. The functional film 160 is held by being sandwiched between the first member 131 and the second member 140. For this reason, the structure in which the functional film 160 is disposed on the inner space S1 side of the communication passage W10 with respect to the pressure valve 150 can be realized with a simple structure.

  In addition, according to power storage device 100 according to the present embodiment, first member 131 and second member 140 are joined by screwing, so that stronger joining between first member 131 and second member 140 is achieved. Can be realized with a simple configuration.

  Further, according to power storage device 100 according to the present embodiment, functional film 160 is held by being sandwiched between end portion 142 of second member 140 and opposing portion 133 of first member 131. For this reason, it is possible to realize a stronger holding of the functional film 160 with a simple configuration.

  Further, according to power storage device 100 according to the present embodiment, since gasket 170 is provided between first member 131 and second member 140, the joint between first member 131 and second member 140 is provided. For example, when a predetermined water pressure is applied to the communication portion 130A at the time of submergence or the like, water can be prevented from entering the exterior body 200 from the joint portion.

(Modification)
(1)
In power storage device 100 according to the above-described embodiment, as shown in FIG. 5, communication portion 130 is formed so as to protrude outward from exterior body 200 along the X-axis direction. Absent. For example, as illustrated in FIG. 8, the communication unit 130 may be a communication unit 130 </ b> B that forms a communication path W <b> 20 embedded in the exterior body 200. In this case, the communication part 130 </ b> B has a part where the part where the pressure valve 150 and the functional film 160 are provided is embedded inside the exterior body 200 and a part protruding outside the exterior body 200. The latter part is connected to the exhaust hose 500, for example.

  As shown in FIG. 9, the communication portion 130 may be a communication portion 130 </ b> C that forms a communication passage W <b> 30 such that the pressure valve 150 and the functional film 160 are non-parallel. That is, the communication part 130 </ b> C may have a shape bent between the pressure valve 150 and the functional film 160 as shown in FIG. 9.

(2)
In power storage device 100 according to the above embodiment, communication portion 130A is joined by screwing inner wall surface 132 of first member 131 and outer wall surface 141 of second member 140, but is not limited thereto. Alternatively, the outer wall surface of the first member and the inner wall surface of the second member may be joined by screwing. In this case, the second member is formed with a facing portion that faces the end of the first member on the inner space S1 side, and the functional film is disposed between the end of the first member and the facing portion of the second member. May be held. Further, a gasket may be provided between the end portion of the first member and the facing portion of the second member.

  That is, when the first member and the second member are joined by being screwed, one outer wall surface of the first member and the second member and the other inner wall surface of the first member and the second member are screwed. What is necessary is just to join by combining.

  In the first member and the second member, when the outer wall surface of one member is fitted and joined to the inner wall surface of the other member, the other of the first member and the second member includes the first member and The opposing part which opposes one edge part of a 2nd member is formed, and the functional film is one edge part of a 1st member and a 2nd member, and the other opposing part of a 1st member and a 2nd member. What is necessary is just the structure hold | maintained by being pinched by.

(3)
In the power storage device 100 according to the above embodiment, the first member 131 and the second member 140 are joined by screwing, but the joining form is not limited to screwing, and is bonding by an adhesive. Alternatively, it may be a fit using a snap fit, a joint by press fitting, a joint using a flange, or a joint by welding / welding. The form does not matter.

  Even in the modification (3), as in the modification (2), in the first member and the second member, the outer wall surface of one member is fitted into the inner wall surface of the other member and joined. The following configuration may be applied. That is, the other of the first member and the second member is formed with a facing portion that faces one end of the first member and the second member, and the functional film is one of the first member and the second member. A configuration that is held by being sandwiched between the end portion of the first member and the other facing portion of the first member and the second member may be applied to the joining of the modification example (3).

(4)
In the power storage device 100 according to the above embodiment, the pressure valve 150 is provided on the external space S2 side with respect to the functional film 160, but the pressure valve 150 is not necessarily provided. That is, even if the exterior body 200 does not include the pressure valve 150, the communication portion is provided with a functional film that allows gas to pass but does not allow liquid to pass through. It is possible to prevent foreign substances such as from entering the interior of the exterior body from the communication path and water from flowing into the exterior body from the communication path when submerged. Of course, as in the power storage device 100 according to the above-described embodiment, when the functional film 160 and the pressure valve 150 are both provided, the foreign matter such as water is more reliably than the configuration where only the functional film 160 is provided. This is preferable because intrusion due to scattering of water and inflow of water can be prevented.

(5)
In the power storage device 100 according to the above embodiment, the exterior body 200 stores a plurality of power storage elements 400, but is not limited thereto, and may be configured to store one power storage element 400.

  The present invention relates to a power storage device having a communication path that can discharge gas generated in the event of an abnormality to the outside of the exterior body, and it is difficult for foreign matter or the like to enter a space inside the exterior body of the power storage device, and water from the communication path. It is useful as a power storage device that can prevent the intrusion.

DESCRIPTION OF SYMBOLS 100 Power storage device 110 External positive electrode terminal 120 External negative electrode terminal 130, 130A-130C Communication part 131 1st member 132 Inner wall surface 133 Opposite part 140 Second member 141 Outer wall surface 142 End part 143 Opening part 144 Through-hole 150 Pressure valve 151 Shaft part 152 Umbrella part 160 Functional film 170 Gasket 200 Exterior body 210 Cover body 220 Exterior body main body 300 Bus bar 310 Circuit board 400 Electric storage element 410 Container 420 Positive electrode terminal 430 Negative electrode terminal 440 Safety valve 500 Exhaust hose S1 Internal space S2 External space W10, W20, W30 Communication passage W11 First passage W12 Second passage

Claims (5)

One or more power storage elements;
An exterior body that houses the one or more power storage elements;
With
The exterior body has a communication portion that forms a communication path for communicating an internal space of the exterior body with an external space,
The communication portion has (1) a functional film that allows gas to pass therethrough and does not allow liquid to pass, and (2) communicates with the internal space in a first direction, and (3) the external space. A power storage device that communicates in a second direction substantially perpendicular to the first direction. The power storage device according to claim 1, wherein the functional film is disposed in a direction substantially parallel to the second direction. The communication part is constituted by a first member and a second member,
The first member forms a first passage on the inner side of the exterior body in the communication passage,
The second member forms a second passage outside the exterior body in the communication passage,
The power storage device according to claim 1, wherein the functional film is held by being sandwiched between the first member and the second member. On the other inner wall of the first member and the second member, a facing portion that is opposed to one end of the first member and the second member is formed,
The power storage according to claim 3, wherein the functional film is held between one end of the first member and the second member and the other facing portion of the first member and the second member. apparatus. The communication part further includes:
The power storage device according to claim 3, further comprising an annular gasket for sealing the first member and the second member, which is sandwiched between portions where the first member and the second member are joined.

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